Rice cv. Bahia mutagenized population: a new resource for rice breeding in the Mediterranean basin

Abstract

In the Mediterranean basin, the limited availability of rice genetic resources restricts the success of breeding programs. Although mutation induction is a powerful alternative to generate desired novel variations, current rice mutant resources have little relevance in the Mediterranean breeding programs that require well-adapted cultivars for maximum performance. In this work a genome-wide mutation induction has been used on rice cv Bahia, a japonica cultivar well adapted to the Mediterranean climate and cultural practices, to increase its genetic variability and to facilitate the generation and selection of interesting agronomical traits. Bahia mutant collections were generated by irradiating seed batches with either 30 Gy fast neutrons or 250 Gy gamma rays. After initial screening of M2 plants and followed by evaluation of M3 and M4 generations in open field, elite genotypes were selected. The selected lines carried morphological and physiological changes of agronomical interest such as earliness, culm height reduction, yield increase and spontaneous spots appearance in leaves. The mutants are useful as breeding materials for improving varieties in the Mediterranean.

Morphological and Phenotypic Effects of Fast Neutron Irradiation (FNI) on Lagos Spinach (<i>Celosia argentea</i> L.)

“…Reduction in the percentage germination recorded in this study, particularly at higher irradiated time of exposure conformed to the work of Muhanmu and kethekar [16], Domingo et al [17]. They reported decrease trend of germination percentage with increased in mutagenic concentrations/doses.…”

“…Low doses of radiation has been reported to increase the enzymatic activation and awakening of the stored energy necessary for initial growth in seed cotyledons, which results in stimulating the rate of cell division and affects not only germination, but also vegetative growth and flowering [20]. Contrast to these findings of Domingo et al [17] reported reduction in height of M 2 Oryza sativa cv Bahia (japonica) mutagenised with FN. Also, Hasbullah et al [21] suggested that irradiation may prohibit the auxin activities and change the morphogenetic responses in plant.…”

Analysis of PHOTOPERIOD SENSITIVITY5 Sheds Light on the Role of Phytochromes in Photoperiodic Flowering in Rice

“…The s73 mutant was identified as a recessive, early flowering mutant in field screenings employing an irradiated Bahia mutant population (Domingo et al, 2007). Bahia is a japonica type cultivar, widely grown across the Mediterranean region.…”

The Improvement of Early Maturity Red Rice Mutant Trait for Drought Tolerance

“…Previous study showed no increase in weight of filled seeds of mutant compared to previous. 16 17 The accession of red rice with 150 gray dose of irradiation can actually be used to improve the traits of the plant.…”